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Introduce MAP_HUGETLB

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Justine Tunney 2024-05-22 12:10:03 -07:00
parent 9b87dd2b87
commit f029375d39
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GPG key ID: BE714B4575D6E328
6 changed files with 7 additions and 3 deletions
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1
libc/sysv/consts.sh
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@ -230,6 +230,7 @@ syscon mmap MAP_NORESERVE 0x00004000 0x00004000 0x00000040 0x00000040 0
syscon mmap MAP_POPULATE 0x00008000 0x00008000 0 0 0x00040000 0 0 0 # MAP_PREFAULT_READ on FreeBSD; can avoid madvise(MADV_WILLNEED) on private file mapping
syscon mmap MAP_NONBLOCK 0x00010000 0x00010000 0 0 0 0 0 0
syscon mmap MAP_SYNC 0x00080000 0x00080000 0 0 0 0 0 0 # perform synchronous page faults for mapping (Linux 4.15+)
syscon mmap MAP_HUGETLB 0x00040000 -1 -1 -1 -1 -1 -1 -1 # make it inherit across execve()
syscon mmap MAP_INHERIT -1 -1 -1 -1 -1 -1 0x00000080 -1 # make it inherit across execve()
syscon mmap MAP_HASSEMAPHORE 0 0 0x00000200 0x00000200 0x00000200 0 0x00000200 0 # does it matter on x86?
syscon mmap MAP_NOSYNC 0 0 0 0 0x00000800 0 0 0 # flush to physical media only when necessary rather than gratuitously; be sure to use write() rather than ftruncate() with this!

2
libc/sysv/consts/MAP_HUGETLB.S Normal file
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@ -0,0 +1,2 @@
#include "libc/sysv/consts/syscon.internal.h"
.syscon mmap,MAP_HUGETLB,0x00040000,-1,-1,-1,-1,-1,-1,-1

1
libc/sysv/consts/map.h
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@ -13,6 +13,7 @@ extern const int MAP_FILE;
extern const int MAP_FIXED;
extern const int MAP_FIXED_NOREPLACE;
extern const int MAP_HASSEMAPHORE;
extern const int MAP_HUGETLB;
extern const int MAP_INHERIT;
extern const int MAP_JIT;
extern const int MAP_LOCKED;